I'm Agree with EGOL

Taxonomies: Categories and Tags

Implementing categories and tags on your website is an important way to add structure to it. These taxonomies group content on a certain topic. When used properly, Google will understand the structure of your site better.

Categories have a hierarchical structure. There can be subcategories within categories. Tags do not have a hierarchical structure. Think of it like this: categories are the table of contents of your website, and tags are the index.

Duplicate content

Duplicate content means that the same content is shown in multiple locations on your site. As a reader, you don’t mind: you’ll get the content you came for. But it confuses a search engine: it has to pick which one to show in the search results, as it doesn’t want to show the same content twice.

Above that, when other websites link to your product, chances are some of them link to the first URL, and others link to the second URL. If these duplicates were all linking to the same URL, your chance of ranking in the top 10 for the relevant keyword would be much higher.

The solution for duplicate content is a so-called canonical link. A canonical link tells the search engines: yes, this content is duplicate, and this one is the original content.

Structure of your website...why? The importance of site structure for SEO
The structure of a website or a blog is of great importance for its chances to rank in search engines. In my opinion, there are two main reasons for this:

1 - A decent structure makes sure Google ‘understands’ your site.

The way your website is structured will give Google important clues about where to find the most important content. Your site’s structure determines whether a search engine can understand what your site is about, and how easily it will find and index the content relevant to your site’s purpose and intent. A good structure could, therefore, lead to a higher ranking in Google.

2 - A decent structure makes sure you do not compete with your own content.

On your site, you will probably write multiple pages about similar topics. Let's take an example you have a recipes website and you want to create a structure for your website. So you several recipes on your website and you have several categories such as Italian recipes, French recipes, Mexican recipes and so on. On the other hand, your tags can be used in another approach such as breakfast, dinner, lunch, low cab ect on this way you do not compete with your own content resulting in higher rankings.

There is no difference between a free or premium domain, at least Google does not evaluate the domain itself, what Google evaluates is the profile of the domain, backlinks, internal links, content, relevance and so on. So usually free domain has no value from the Google perspective...why? who will invest money, time, links and content on a free domain, I mean if you have the money to pay for hosting, content, and links why you will use a free domain....does not make sense. How many Blogspot sites, free WordPress.com websites do you know that have real value and authority.

That's why I think, .cf / .tk / .gq / .ml / .ga probably will not have any value for linkbuilding.

Are you talking about of On-page Grader? Moz Pro > On-Page Grader. Also, you can check Moz Pro > Campaigns > Page Optimization

Taxonomies: Categories and Tags

Implementing categories and tags on your website is an important way to add structure to it. These taxonomies group content on a certain topic. When used properly, Google will understand the structure of your site better.

Categories have a hierarchical structure. There can be subcategories within categories. Tags do not have a hierarchical structure. Think of it like this: categories are the table of contents of your website, and tags are the index.

Duplicate content

Duplicate content means that the same content is shown in multiple locations on your site. As a reader, you don’t mind: you’ll get the content you came for. But it confuses a search engine: it has to pick which one to show in the search results, as it doesn’t want to show the same content twice.

Above that, when other websites link to your product, chances are some of them link to the first URL, and others link to the second URL. If these duplicates were all linking to the same URL, your chance of ranking in the top 10 for the relevant keyword would be much higher.

The solution for duplicate content is a so-called canonical link. A canonical link tells the search engines: yes, this content is duplicate, and this one is the original content.

Structure of your website...why? The importance of site structure for SEO
The structure of a website or a blog is of great importance for its chances to rank in search engines. In my opinion, there are two main reasons for this:

1 - A decent structure makes sure Google ‘understands’ your site.

The way your website is structured will give Google important clues about where to find the most important content. Your site’s structure determines whether a search engine can understand what your site is about, and how easily it will find and index the content relevant to your site’s purpose and intent. A good structure could, therefore, lead to a higher ranking in Google.

2 - A decent structure makes sure you do not compete with your own content.

On your site, you will probably write multiple pages about similar topics. Let's take an example you have a recipes website and you want to create a structure for your website. So you several recipes on your website and you have several categories such as Italian recipes, French recipes, Mexican recipes and so on. On the other hand, your tags can be used in another approach such as breakfast, dinner, lunch, low cab ect on this way you do not compete with your own content resulting in higher rankings.

So how to fix your errors?

1 - Add title, meta-description and canonical tags to your tag pages.
if you are using WordPress is pretty easy to do it. You just need to install Yoast SEO plugin and check one by one all your tag pages

If the answer were useful do not forget to mark it as a Good Answer CHEERS and Good Luck

The hierarchy of your headers depends on the hierarchy of your content, so google use that hierarchy to understand the relevance of your content, so please don't change and destroy your content and your opportunities

Heading — HTML has six different heading tags — h1, h2, and so on. The h1 is considered the most important tag, and the h6 is the least important. The tags are often formatted from large (or most important) to smallest (or least important).

Let's take an example, we are going to create an article about
so let's take "buy a MacBook Pro" as the main keyword and here is your structure

Note: this just an example base on my experience

<---------------------------------------------------------------------------------------------->

H1-All you need to know before to buy a MacBook Pro - Main Keyword Goes Here
Then you add a description or Introduction Paragraph with the main keyword

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation

H2-the best places to buy a Mac Book Pro (Sub-topic secondary keyword or secondary topic) in this case the main topic is "buy a MacBook Pro" and the second topic is "where to buy it online" as you can see there is a direct relation between your H1-tag and your H2-tag

Paragraph related to this subtopic (Here some introductory paragraph)

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation

And then here comes a list of possibles website where you can buy a Mac Book Pro (Again, inside your h2 you put a list of h3-tags that are directly related to the h2)

• H3- Official Website (Paragraph related to this content)
• H3- Amazon Website (Paragraph related to this content)
• H3- Ebay Website (Paragraph related to this content)
• H3- Apple Local Store(Paragraph related to this content)

<---------------------------------------------------------------------------------------------->

With this example, you can see that every header follow a structure. So if you have a problem with your font-size or font-weight, you just need to add some custom CSS, in fact, is pretty easy for any developer with a few experience ( Example CSS Headings )

_What I'm trying to say with this is, first _you _create a structure for your article this include headers, content, lists, call to actions, images and forms, then try to make a layout (nothing complex) and  in this layout you can play with font-size, line-height or font-weight the easiest way to do that is using the _span- tag, with WordPress is easy to do it.

Why text structure is important for SEO - Yoast Article * How to use headings on your site - Yoast Article* How Links in Headers, Footers, Content, and Navigation Can Impact SEO - Whiteboard Friday